<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="add" />
    <!-- event.target.value -->
  </div>
</template>
<script>
  import { nanoid } from 'nanoid'
  export default {
    name: 'MyHeader',
    // data(){
    //   event:''
    // },
    methods: {
      add(event) {
        //判断输入是否为空
        if (!event.target.value) alert('输入不能为空')
        //将用户输入包装成为todo对象
        else {
          const todoObj = {
            id: nanoid(),
            title: event.target.value,
            done: false
          }
          this.$emit('receive', todoObj)
          console.log(todoObj);
          event.target.value = "";
        }
      }

    }

  }
</script>
<style scoped>
  /*header*/
  .todo-header input {
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 7px;
  }

  .todo-header input:focus {
    outline: none;
    border-color: rgba(82, 168, 236, 0.8);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
  }
</style>